I have no idea what a "rendition percent" is. I'm skeptical that the product is C2H5O. I think it may be C2H6O
Finish (if necessary) and balance the equation.
Convert 450 g of C2H4 to mols. mols = grams/molar mass.
Use the coefficients in the balanced equation to convert mols C2H4 to the product.
Convert mols product to grams. g = mols x molar mass. This is the theoretical yield (TY). The actual yield (AY) is 4.7g.